CODEWITHSUNDEEP
jekyllliquid
user10204688
user10204688

Reputation: 95

How can I concatenate arrays in liquid

This kind of Q&A was exist before but there was anything fit with mine. I want to concatenate arrays in liquid within empty array and array

array1
subject = ''
array2
tsubject = ["appple", "pine appeld"]
array what I want to get
["appple", "pine appeld"]

to combine this I tried

{% assign subject = '' %}
{% for post in site.programming %}
  {% assign tsubjects = post.categories %}
  {% assign subject=subject | append: tsubjects %}
{% endfor %}

{% assign subject = '' %}
{% for post in site.programming %}
  {% assign tsubjects = post.categories %}
  {% subject=subject | concat: tsubjects %} 
{% endfor %}

but nothing changed, subject was still empty. I think this is because of concat, concat concatenate array shapes like this:
{% assign vegetables = "broccoli, carrots, lettuce, tomatoes" | split: ", " %}
But I want concatenate below type:
{% assign vegetables = ["broccoli", "carrots", "lettuce", "tomatoes"] | split: ", " %}
I'm not sure about reason why they don't work. please help me.

Upvotes: 1

Views: 2082

Answers (1)

David Jacquel
David Jacquel

Reputation: 52819

You're mixing string/array values and filters.

{% assign subject = '' %}
subject : {{ subject | inspect }} "" <== String

{% assign subject = '' | split: '' %}
subject : {{ subject | inspect }} [] <== Array

If you want to make an array from all categories in programming collection, you must concat two arrays, and it can be something like :

{% comment %} --- Creates an empty array {% endcomment %}
{% assign subject = '' | split: '' %}

{% comment %} --- Debug output {% endcomment %}
subject : {{ subject | inspect }}

{% for post in site.programming %}
  {% assign tsubjects = post.categories %}

  {% comment %} --- Just to be sure that there is something in post.categories {% endcomment %}
  tsubjects : {{ tsubjects | inspect }}

  {% assign subject=subject | concat: tsubjects %}

  {% comment %} --- Debug output {% endcomment %}
  concat : {{ subject | inspect }}

{% endfor %}

{% comment %} --- Makes sure that values are unique {% endcomment %}
{% assign subject = subject | uniq %}
uniq : {{ subject | inspect }}

Upvotes: 3

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